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I CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br />' Certificate No 2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Cal Fuels Sampled 04-04-03 <br /> of Northern California Reference Number 5632 Received 04-08-03 <br /> 837 Shaw Road Sample Description Water Extracted 04-09-03 <br /> Stockton,CA 95215 Sample Prep/Analysis Method EPA 5030/8260 Analyzed 04-09-03 <br /> Attn Tim Cuellar Lab Numbers 5632-11W, 12W, 13W, 14W 15W Reported 04-18-03 <br /> I <br /> GASOLINE ADDITIVES AND SOLVENTS BY EPA METHOD 8260 GC/MS <br /> IANALYTE REPORTING SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> LIMIT MW 11 MW 12 MW 13A MW 13B MW 13C <br />' — 040403 040403 040403 040403 – 040403 <br /> (per/L) (ug/L) (ug/L) (ug/L) (ug/L) _(ug/L) <br /> Ft,IEL OXYGENATES <br />' Methyl tert-Butyl Ether(MTBE) 050 NO NO NO ND NO <br /> Di-isopropyl Ether (DIPS) 050 NO NO NO ND NO <br /> Ethyl tert-Butyl Ether (ETBE) 050 NO NO NO NO NO <br /> tert-Amyl Methyl Ether(TAME) 0 50 NO NO NO NO NO <br /> • tent-Butanol(TBA) 20 NO NO ND ND ND <br /> I VOLADU HALOC BONS <br /> 1 2-Dichloroethane (1 2-DCA) 050 NO NO NO ND ND <br /> iEthylene Dibromide (EDB) 150 NO NO NO ND NO <br /> Report Limit Multiplication Factor 1 1 1 1 1 <br /> I <br /> Surrogate Recoveries <br /> 1,2-Dichloroethane-d4 112% 714% 742% 689% 723% <br /> 1 oluene-d8 691% 728% 785% 695% 649% <br /> Instrument iD Varian Saturn 3 MS&HP 5972 MS <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit=Reporting Limit x Report Limit Multiplication Factor <br /> (pg/L)= microgra s per liter or parts per billion(ppb) <br /> ANALYST APPROVED BY <br /> Clair J Cone Jam •C Phillips <br /> ILa ratory Director <br />